Measurement of moisture spatial profiles in transformer pressboard

Author

Mamishev, A.V. ; Du, Y. ; Lesieutre, B.C. ; Zaha, M.

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA

Volume

1

fYear

1998

fDate

25-28 Oct 1998

Firstpage

323

Abstract

Moisture concentration was measured in a 1.5 mm thick transformer pressboard as a function of time and position during moisture diffusion process. A flexible interdigital three-wavelength sensor was used to provide the necessary information regarding pressboard dielectric properties at different depths from the sensor-pressboard interface. Results were obtained by processing the signals from the three-wavelength sensor, air humidity sensor, and thermocouple installed in the experimental chamber. Air-pressboard equilibrium curves were used to provide boundary conditions and the relative moisture level magnitude. The proposed technology has significant potential for measurement of diffusion processes in various dielectrics

Keywords

humidity sensors; insulation testing; moisture measurement; power transformer insulation; thermocouples; 1.5 mm; air humidity sensor; air-pressboard equilibrium curves; boundary conditions; flexible interdigital three-wavelength sensor; moisture concentration; moisture diffusion process; moisture spatial profiles; relative moisture level magnitude; sensor-pressboard interface; thermocouple; three-wavelength sensor; transformer pressboard; Boundary conditions; Dielectric measurements; Diffusion processes; Humidity; Moisture measurement; Position measurement; Signal processing; Thermal sensors; Thickness measurement; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1998. Annual Report. Conference on

Conference_Location

Atlanta, GA

Print_ISBN

0-7803-5035-9

Type

conf

DOI

10.1109/CEIDP.1998.733995

Filename

733995